Fastener Type Chart
Fastener Categories |
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| Wood
Screws Screws with a smooth shank and tapered point for use in wood. |
Machine
Screws Screws with threads for use with a nut or tapped hole. |
Sheet
Metal Screws Fully threaded screws with a point for use in sheet metal. |
Self
Drilling SMS A Sheet metal screw with a self drilling point. |
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| Hex
Bolts Bolts with a hexagonal head with threads for use with a nut or tapped hole. |
Carriage Bolts |
Lag
Bolts Bolts with a wood thread and pointed tip. Abbreviated Lag |
Set
Screws Machine screws with no head for screwing all the way into threaded holes. |
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| Socket Screws Socket screws, also known as Allen head are fastened with a hex Allen wrench. |
Eye Bolts A bolt with a circular ring on the head end. Used for attaching rope or chain. |
Eye Lags Similar to an eye bolt but with wood threads instead of machine thread. |
U-Bolts Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend. |
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| J-Bolts J shaped bolts are used for tie-downs or as an open eye bolt. |
Hanger Bolts Hanger bolts have wood thread on one end and machine thread on the other end. |
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Head Styles |
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Flat A countersunk head with a flat top. Abbreviated FH |
Oval A countersunk head with a rounded top. Abbreviated OH or OV |
Pan A slightly rounded head with short vertical sides. Abbreviated PN |
Truss |
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| Round |
Hex A hexagonal Head. Abbreviated HH or HX |
Hex Washer A hex head with built in washer. |
Slotted Hex Washer A hex head with built in washer and a slot. |
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Socket Cap |
Button A low profile rounded head using a socket drive. |
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Drive Types |
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Phillips and Frearson An X shaped drive. Abbreviated PH |
Slotted A slot in the head. Abbreviated SL |
Combination A combination of slotted and Phillips drives. Abbreviated Combo |
Socket, Hex or Allen A hexagonal hole for use with an Allen wrench. |
Nut Types |
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Hex A six sided nut. Also referred to as a finished hex nut. |
Nylon
Insert Lock A nut with a nylon insert to prevent backing off. Also referred to as a Nylock |
Jam A hex nut with a reduced height. |
Nylon
Insert Jam Lock A nylock nut with a reduced height. |
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Wing A nut with 'wings' for hand tightening. |
Cap A nut with a domed top over the end of the fastener. |
Acorn Acorn nuts are a high crown type of cap nut, used for appearance. |
Flange A nut with a built in washer like flange. |
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Tee A nut designed to be driven into wood to create a threaded hole. |
Square A four sided nut. |
Prevailing
torque lock A non-reversible lock nut used for high temperature applications |
K-Lock or Kep A nut with an attached free-spinning external tooth lockwasher. |
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Coupling Coupling nuts are long nuts used to connect pieces of threaded rod or other male threaded fasteners. |
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Washer Types |
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Flat A flat washer used to distribute load. Available in SAE, USS, and other patterns. |
Fender An oversize flat washer used to further distribute load especially on soft materials. |
Finishing A washer used to obtain a 'finished' look. Usually used with oval head screws. |
Split
Lock The most common style of washer used to prevent nuts and bolts from backing out. |
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External
Tooth Lock A washer with external 'teeth' Used to prevent nuts and bolts from backing out. |
Internal
Tooth Lock A washer with internal 'teeth' Used to prevent nuts and bolts from backing out. |
Square A square shaped washer. |
Dock Dock washers have a larger outside diameter and are thicker than standard. |
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Ogee Thick, large diameter, cast iron washers with a curved or sculpted appearance. Typically used in dock and wood construction |
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